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Q: What 4 numbers can make 81?

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Multiples of 81

The only prime numbers between 81 and 90 is... 83

It takes four. 3 x 3 x 3 x 3 = 81

They are: 79+2 = 81

36 is 4 9ths of 81.

Related questions

How about: 40+41 = 81

81 and 9 if you add them. 4 and 25 if you multiply them.

9 x 9 = 81 :(

Negative 9 times 9= Negative 81

81 and 4

all square numbers

It depends on what average you want to find. To find the mean of 81, 81, 98, and 91 add the numbers together and divide by 4 (the number of numbers you added). 81 + 81 + 98 + 91 = 351 351 divided by 4 = 87.75. To find the median, list the numbers in order and find the one in the middle. 81, 81, 91, 98 81 and 91 are in the middle. To find the mode, look for the number that appears the most, 81 appears twice and the other numbers appear once. 81 is the mode.

There are infinitely many different choices of 3 numbers that add up to 81. 50 + 30 + 1 = 81 40 + 40 + 1 = 81 10 + 11 + 60 = 81 etc.

25 and 81

16, 81, 625, and 2401

There are not two INTEGERS that can add to make 9 and multiply to make 4, however there are some irrational numbers that will do the job. Let x and y be the two numbers. x + y = 9 xy = 4 so y = 4/x x + 4/x = 9 x² + 4 = 9x x² - 9x + 4 = 0 using the quadratic formula, x = (9 ± √[81-4(1)(4)])/2 = (9 ± √{81-16])/2 = (9 ±√65)/2 ≈ 8.531129 or 0.468871 So the two numbers are approximately 0.468871 and 8.531129

They are: 9+81 = 90

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